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Problem 1 (65 pts): The cylinder of a Diesel engine is initially filled with air at 100 kPa and 2...
A) Calculate the net work output per kmol fuel. In your analysis, assume that the fuel is introdu...
A) Calculate the net work output per kmol fuel. In your
analysis, assume that the fuel is introduced as a gas at 298K.
Now consider an Ideal Diesel Cycle that has the same compression
ratio and produces the same net work output as in Problem 1. If the
cycle has a cut-off ratio of 2:
B) Calculate the required heat input per unit mass of air.
C) Find the temperature at each state of the cycle.
Problem 1 (65 pts):...
2. Analyze an Audi 3.0-liter TDI V6 Biturbo diesel engine using an air-standard Diesel cycle that...
2. Analyze an Audi 3.0-liter TDI V6 Biturbo diesel engine using an air-standard Diesel cycle that addresses the "real" effects of non-isentropic compression/expansion, air-fuel ratio, fuel heating value, incomplete combustion, exhaust residual, and heat loss. The engine is four-stroke, has six cylinders with a compression ratio of 16.0, and develops maximum power at 4250 rpm. Assume the following: the diesel fuel heating value is Quv 42,600 kJ/kg, the air-to-fuel ratio (AF) at maximum power is 25, and the combustion efficiency...
1. (30P) A twenty-cylinder MTU 4 STROKE 20V 4000 M93 marine diesel engine is designed to...
1. (30P) A twenty-cylinder MTU 4 STROKE 20V 4000 M93 marine diesel engine is designed to develop 3490 kW brake power at 1800 rpm. The bore is 170mm and stroke length is 210 mm for each cylinder and bsfc is 205 g/kWh. The calorific value of the petrol is 42 800kJ/kg. The inlet air manifold conditions are 80 kPa and 313 K. and The engine has a volumetric efficiency of 0.82. Calculate: a) Displacement (litre) b) Bmep (kPa) c) Fuel...
A diesel engine with a compression ratio of 14.5 starts the compression stroke with air at...
A diesel engine with a compression ratio of 14.5 starts the compression stroke with air at 101 kPa and 42ºC. Fuel with a heating value of 43,260 kJ/kg is used with a fuel/air ratio of 0.03 kg fuel/kg air. At full throttle the airflow to engine is measured to be 0.1 m3/s and 5% of the fuel does not burn due to poor fuel-air mixing. Model the engine as airstandard with variable specific heats, draw the cycle on a P-V...
A fuel-air mixture with a fuel-to-air equivalence ratio of 0.6 enters an engine cylinder at 400...
A fuel-air mixture with a fuel-to-air equivalence ratio of 0.6 enters an engine cylinder at 400 K where it is then compressed. After compression the mixture is at 750 K. Calculate the power needed for this compression process if the air mass flow rate is 100 kg/hr. Also calculate the compression ratio for this process. Textbook : John B. Heywood - Internal Combustion Engine Fundamentals 2nd Edition
The answer is: 26.3% and 56.48 hp. Problem 12: An actual four-stroke SI engine has a...
The answer is: 26.3% and 56.48 hp.
Problem 12: An actual four-stroke SI engine has a total cylinder volume of 0.0015 m3 and a compression ratio of 9:1. The engine runs at 3000 rpm. At the start of the compression stroke the air is at 303 K and a pressure of 100 kPa. The ratio of the actual thermal efficiency of the engine to the air-standard cycle efficiency is 45%. The air to fuel ratio is 13:1. The internal energy...
İdi ner An ideal diesel engine The state of air at the beginning of the e maximum temperature in the eycle air) (us...
İdi ner An ideal diesel engine The state of air at the beginning of the e maximum temperature in the eycle air) (using variable specific hea a) Draw the P- has a compression ratio of 20 and uses air as the com 2200K and the cutoff ratio is 1.2. is is 100 kPa and 27C he t) (25marks) V diagram of the diesel cyele termine the internal energies at the beginning and the end of the com pression, end of...
2. The following information is known for a turbocharged 4-stroke Diesel engine, when running at a...
2. The following information is known for a turbocharged 4-stroke Diesel engine, when running at a certain operating point onboard a vessel: (Geometric) compression ratio: Volumetric ratio: Combustion efficiency Heat input efficiency: Mechanical efficiency Entrapped air efficiency: Intake manifold pressure: Intake manifold temperature: v2 / v, = 20 comb = 98% = 75% m = 90% trap = 100% 3.5 bar (abs) 50°C In the above (see also the figure given at the bottom of the back page). VI: Volume...
Define thermodynamic States 1-7 in terms of u,v,T,P,S State Piston position BDC TDC TDC Conditions Air...
Define thermodynamic States 1-7 in terms of u,v,T,P,S State Piston position BDC TDC TDC Conditions Air and fuel at a known pressure and temperature After isentropic compression from BDC to TDC After constant volume combustion at TDC. Assume the products are only CO2, H20, 02, and N2 After isentropic expansion from TDC to BDC. Assume the species are the same as state 3 4 BDC BDC TDC TDC For the engine given in the table below Number of cylinders Bore...
Problem 6. Compute the brake mean effective pressure of a four-cylinder, two-stroke engine, 100 mm bore...
Problem 6. Compute the brake mean effective pressure of a four-cylinder, two-stroke engine, 100 mm bore 125 mm stroke when it develops a torque of 490 Nm. Problem = 7. Find the brake thermal efficiency of an engine which consumes 7 kg of fuel in 20 minutes and develops a brake power of 65kW. The fuel has heating value of 42000 kJ/kg. Problem # 8. Find the mean piston speed of a diesel engine running at 1500 rpm. The engine...
A) Calculate the net work output per kmol fuel. In your
analysis, assume that the fuel is introduced as a gas at 298K.
Now consider an Ideal Diesel Cycle that has the same compression
ratio and produces the same net work output as in Problem 1. If the
cycle has a cut-off ratio of 2:
B) Calculate the required heat input per unit mass of air.
C) Find the temperature at each state of the cycle.
Problem 1 (65 pts):...
2. Analyze an Audi 3.0-liter TDI V6 Biturbo diesel engine using an air-standard Diesel cycle that addresses the "real" effects of non-isentropic compression/expansion, air-fuel ratio, fuel heating value, incomplete combustion, exhaust residual, and heat loss. The engine is four-stroke, has six cylinders with a compression ratio of 16.0, and develops maximum power at 4250 rpm. Assume the following: the diesel fuel heating value is Quv 42,600 kJ/kg, the air-to-fuel ratio (AF) at maximum power is 25, and the combustion efficiency...
1. (30P) A twenty-cylinder MTU 4 STROKE 20V 4000 M93 marine diesel engine is designed to develop 3490 kW brake power at 1800 rpm. The bore is 170mm and stroke length is 210 mm for each cylinder and bsfc is 205 g/kWh. The calorific value of the petrol is 42 800kJ/kg. The inlet air manifold conditions are 80 kPa and 313 K. and The engine has a volumetric efficiency of 0.82. Calculate: a) Displacement (litre) b) Bmep (kPa) c) Fuel...
The answer is: 26.3% and 56.48 hp.
Problem 12: An actual four-stroke SI engine has a total cylinder volume of 0.0015 m3 and a compression ratio of 9:1. The engine runs at 3000 rpm. At the start of the compression stroke the air is at 303 K and a pressure of 100 kPa. The ratio of the actual thermal efficiency of the engine to the air-standard cycle efficiency is 45%. The air to fuel ratio is 13:1. The internal energy...
İdi ner An ideal diesel engine The state of air at the beginning of the e maximum temperature in the eycle air) (using variable specific hea a) Draw the P- has a compression ratio of 20 and uses air as the com 2200K and the cutoff ratio is 1.2. is is 100 kPa and 27C he t) (25marks) V diagram of the diesel cyele termine the internal energies at the beginning and the end of the com pression, end of...
2. The following information is known for a turbocharged 4-stroke Diesel engine, when running at a certain operating point onboard a vessel: (Geometric) compression ratio: Volumetric ratio: Combustion efficiency Heat input efficiency: Mechanical efficiency Entrapped air efficiency: Intake manifold pressure: Intake manifold temperature: v2 / v, = 20 comb = 98% = 75% m = 90% trap = 100% 3.5 bar (abs) 50°C In the above (see also the figure given at the bottom of the back page). VI: Volume...
Define thermodynamic States 1-7 in terms of u,v,T,P,S State Piston position BDC TDC TDC Conditions Air and fuel at a known pressure and temperature After isentropic compression from BDC to TDC After constant volume combustion at TDC. Assume the products are only CO2, H20, 02, and N2 After isentropic expansion from TDC to BDC. Assume the species are the same as state 3 4 BDC BDC TDC TDC For the engine given in the table below Number of cylinders Bore...
Problem 6. Compute the brake mean effective pressure of a four-cylinder, two-stroke engine, 100 mm bore 125 mm stroke when it develops a torque of 490 Nm. Problem = 7. Find the brake thermal efficiency of an engine which consumes 7 kg of fuel in 20 minutes and develops a brake power of 65kW. The fuel has heating value of 42000 kJ/kg. Problem # 8. Find the mean piston speed of a diesel engine running at 1500 rpm. The engine...
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